Mosquito larvicidal activity of silver nanoparticles synthesised using actinobacterium, Streptomyces sp. M25 against Anopheles subpictus, Culex quinquefasciatus and Aedes aegypti

Abstract

The present work reports the larvicidal potential of microbially synthesised silver nanoparticles (AgNPs) by using an actinobacterium, Streptomyces sp. M25 isolated from Western Ghats, Tamil Nadu, India. The biomass of Streptomyces sp. was exposed to 1 mM silver nitrate (AgNO 3 ) solution. The synthesis of AgNPs was confirmed by visual inspection followed by instrumental analysis such as UV-vis spectroscopy, fourier transform infrared spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy, scanning electron microscopy, atomic force microscopy and transmission electron microscopy (TEM) with selected area electron diffraction. Based on the TEM and XRD analysis, the average size of the AgNPs was determined to be 10-35 nm. 724), respectively. The current study is a rapid, cost effective, eco-friendly and single step approach. The Streptomyces sp. M25 is a newly added source for the synthesis of AgNPs with improved larvicidal activity.

Mosquito larvicidal activity of cadmium nanoparticles synthesized from petal extracts of marigold (Tagetes sp.) and rose (Rosa sp.) flower

“…All these data are presented in Tables 1 and 2. Similar mosquito larvicidal activity was reported by Shanmugasun and Balagurunathan (2013) and Balakrishnan et al (2014) by using silver nanoparticles. Mortality of mosquito larvae was very less when treated with only CdCl 2 salt (Table 3) and flower petal extract (Table 4) which indicates the efficiency of formed nanoparticles towards larvcidal activity.…”

Exposure to nanoceria impacts larval survival, life history traits and fecundity of Aedes aegypti

“…Importantly, the activities found for AgCNPs were not a result of free Ag + . Further, these novel nanoceria contained only ~0.22ppb Ag, which is significantly below the 0.1ppm listed secondary standard of the United States Environmental Protection Agency for drinking water [ 69 ] as well as the levels of Ag reported to exert desired effects on target insects (>1ppm) [ 70 – 72 ]. Given the findings of this study that the presence of food (i.e., organic matter) reduced the nanoparticle larvicidal activity, nanoceria such as AgCNPs would likely best be employed for larval control in environments with low organic material and/or in situations where repeated applications are feasible.…”

Nanolarvicidal Effect of Green Synthesized Ag-Co Bimetallic Nanoparticles on <i>Culex quinquefasciatus</i> Mosquito

“…Diseases caused by mosquito are of a serious threat to modern world in many aspects such as mortality [1]. Mosquitoes are the vectors responsible for many diseases that include most commonly malaria and lymphatic filariasis.…”